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- W1970167939 abstract "The Mt. Taylor volcanic field straddless the southern margin of the San Juan Basin in the southeast corner of the Colorado Plateau. Central activity resulted in the extrusion of rhyolite, dacite alkali andesite, and basaltic andesite flows, from a limited and now deeply eroded area. Coeval with central activity alkali basalt magma erupted from more remote centres, and local activity has apparently continued until a few thousand years ago or less. Major element and Rb, Sr, K2O abundances allow the following rock types to be recognized: early basanite flows and pipes; mildly undersaturated basalts; ‘big-feldspar’ basalts; basaltic-andesites; alkali andesites; dacites; rhyolites. There is marked composition gap between basalts and basaltic andesites. K/Rb, Rb/Sr and87Sr/86Sr data suggest that both alkali olivine basalt and the hypersthene normative ‘big-feldspar’ basalts are mantle derived whereas andesites, dacites, and rhyolites are not. It is suggested that the rhyolites have arisen by partial melting of the granite basement." @default.
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- W1970167939 date "1970-12-01" @default.
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- W1970167939 title "Field evidence and K, Rb, Sr data bearing on the origin of the Mt. Taylor volcanic field, New Mexico, U.S.A." @default.
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